Abellan Beteta, CarlosCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertGarrido Beltrán, LluísGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasOyanguren Campos, Arantza dePérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPotterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Ruiz Valls, PabloVázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2019-05-172019-05-172013-06-120031-9007https://hdl.handle.net/2445/133345A first flavor-tagged measurement of the time-dependent C P -violating asymmetry in B 0 s → ϕ ϕ decays is presented. In this decay channel, the C P -violating weak phase arises due to C P violation in the interference between B 0 s − ¯¯¯ B 0 s mixing and the b → s ¯ s s gluonic penguin decay amplitude. Using a sample of p p collision data corresponding to an integrated luminosity of 1.0     fb − 1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B 0 s → ϕ ϕ signal decays are obtained. The C P -violating phase is measured to be in the interval [ − 2.46 , − 0.76 ]     rad at a 68% confidence level. The p value of the standard model prediction is 16%.8 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2013http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6290002019-05-17info:eu-repo/semantics/openAccess